192 
SMITHSONIAN INSTITUTION 
PLATE 10 
(Figures natural size unless otherwise stated) 
Periechocrinus tennesseensis (Hall) 
PAGE 
• 45 
Fig. I. Lateral view of calyx of typical specimen with smooth surface; 3 and 4 arms to the ray. 
2. Posterior view of similar specimen. 
3, 4. Lateral and ventral views of smaller specimens, showing the numerous small plates of 
tegmen. 
Beech River formation; Decatur County, Tennessee, except fig. 4, which is from 
the Louisville limes.tone, Jefferson County, Kentucky. 
Periechocrinus sp 45 
Fig. 5. A large specimen with long arms and sharp ridges following the radial series; calyx partly 
broken away. 
5a. Opposite view of same with more of calyx shown. 
Beech River formation; Decatur County, Tennessee. 
Saccocrinus benedicti S. A. Miller 46 
Figs. 6, 7, 8, 9. Four specimens with low convex plates; r. post., 1. post. iR, 1. ant. R, and post, views 
of calyx ; all with 10 arms. 
10, II, 12. Three calices with nodose plates; r. ant., 1. ant., and basal views. 
13. Tegmen of specimen with strong stellate outline. 
14. Specimen with sharp stellate ornam.ent, perhaps of a different species. 
Laurel limestone; St. Paul, Indiana. 
Saccocrinus cuspidatus new species 46 
Fig. 15. Calyx of very large specimen with plates surmounted by sharp cusps. 
Louisville limestone; Jefferson County, Kentucky. 
Aorocrinus nodosiis new species 47 
Figs. 16, i6a, i6b. Posterior, dorsal and ventral views of calyx, with strongly nodose plates, show- 
ing anal series leading to opening in tegmen. 
Decatur limestone; below Grandview, Perry County, Tennessee. 
Aorocrinus clarkensis new species 47 
Figs. 17, 17a. Posterior and dorsal views of calyx, with strongly gibbous plates, 3 small BB, and 
very large RR. 
Hamilton, Middle Devonian ; Clark County, Indiana. 
